<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // const num = 123;
        // num = 456;

        const arr = [1,2,3];
        const obj = {
            name:"老王"
        }

        // arr = [4,5,6];

        arr[0] = 'aaa';

        obj.name ='小李'

        console.log(arr);
        console.log(obj);

    </script>
</body>
</html>